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Performance Evaluation of a Direct Sampling GNSS          ReceiverIgnacio (Iñaki) Olabarrieta, A. Alonso, I. Arizaga, J‐M....
Índice1.   Introducción2.   Estrategia de Adquisición Directa3.   Lazo de “Tracking”4.   Detalles de nuestra Implementació...
Introducción
11        64  11    76      .4              5                  E5a/L5    11         8?  12                  E5b     07    ...
Estrategia de Adquisición Directa
Estrategia de Adquisición Directa• “Undersampling”:
Estrategia de Adquisición Directa                                          153.7 MHz   Fs       GPS L1     Galileo E5a   G...
Lazo de “Tracking”
Lazo de “Tracking”
Detalles de nuestra Implementación
Detalles de nuestra ImplementaciónVirtex 4ADC 1500 MHz   (PROGRAMABLE)Input Bw =1.7 GHzResolución de 8 bitsDigital Front‐E...
Resultados
Resultados  GNSS Signal/ Carrier +Noise     Signal       Receiver                                Generator1     Platform  ...
Resultados                                     Signal    GNSS Signal/ Carrier + Noise   Generator1           (1175 MHz)   ...
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PERFORMANCE EVALUATION OF A DIRECT SAMPLING GNSS RECEIVER

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The proliferation of different GNSS systems (GPS L2 & L5, Galileo, etc) opens new possibilities in the design of new receivers which could take advantage of the different options available. The use of extra GNSS systems can improve end user accuracy and service availability. A very interesting option is to produce an all digital receiver which has the advantage of not increasing the hardware elements while providing the flexibility needed in order to cope with different signals. In this letter a special digital signal processing is used in order to employ a single front-end for different frequency bands: GPS L1 and Galileo E5 bands. We gauge the competence of a hardware implementation on a FPGA of such a front-end aided with a code tracking loop and show empirical results of the effects of a jammering signal on the system.

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Transcript of "PERFORMANCE EVALUATION OF A DIRECT SAMPLING GNSS RECEIVER"

  1. 1. Performance Evaluation of a Direct Sampling GNSS  ReceiverIgnacio (Iñaki) Olabarrieta, A. Alonso, I. Arizaga, J‐M. Perre Tecnalia Research & Innovation + Thales Avionics Ignacio.olabarrieta@tecnalia.com
  2. 2. Índice1. Introducción2. Estrategia de Adquisición Directa3. Lazo de “Tracking”4. Detalles de nuestra Implementación5. Resultados
  3. 3. Introducción
  4. 4. 11 64 11 76 .4 5 E5a/L5 11 8? 12 E5b 07 .1 12 4 12 14 15 Introducción 12 27 .6 L2 E5a/E5b Galileo 12 37 12 60 12 78 .7 E6 5 13 00 15 4 15 4 SAR 45 15 59 15 E2 63 15 75 L1 .4 2 15 87 15 E1 Fr 91 e(M que Standard GPS H nc z) y
  5. 5. Estrategia de Adquisición Directa
  6. 6. Estrategia de Adquisición Directa• “Undersampling”:
  7. 7. Estrategia de Adquisición Directa 153.7 MHz Fs GPS L1 Galileo E5a Galileo E5b (MHz) (MHz) (MHz) (MHz) 1383.3 191.7500 207.2500 176.2500 691.6 191.7500 207.2500 176.2500 461.1 191.7500 207.2500 176.2500 307.4 38.0556 53.5556 22.5556 251.5 66.0000 81.5000 50.5000 153.7 38.0556 53.5556 22.5556 110.7 25.7600 41.2600 10.2600
  8. 8. Lazo de “Tracking”
  9. 9. Lazo de “Tracking”
  10. 10. Detalles de nuestra Implementación
  11. 11. Detalles de nuestra ImplementaciónVirtex 4ADC 1500 MHz   (PROGRAMABLE)Input Bw =1.7 GHzResolución de 8 bitsDigital Front‐End IF1= 38 Filter Filter X IF2=1.5MHz Decimator Band L1 22->18 bits 48->8 bits Decimation R=5 14 bits coef (17-0) (27-20) L1 R=2 14 bits coef 22->8 bits L.O: 39.5 MHz (18-11) Filter ADC 8bits Filter IF1= 53.6 X IF2=15MHz Decimation Mx Out Fs=153.7 MHz Band E5a 23->18 bits 48->8 bits E5 R=2 8 bit 22->8 bits 14 bits coef (17-0) (27-20) 14 bits coef (18-11) L.O: 38.6 MHz 22->8 bits (18-11) Filter Filter IF1= 22.6 X IF2= 15MHz Decimation Band E5b 23 ->18 bits 48->8 bits E5 R=2 14 bits coef (17-0) (27-20) 14 bits coef L.O: 37.6 MHz “SDR Direct‐Sampling Device for multistandar GNSS Signals”, A.Alonso, J‐M. Perré and I.Arizaga CSNDSP 2008
  12. 12. Resultados
  13. 13. Resultados GNSS Signal/ Carrier +Noise Signal Receiver Generator1 Platform (1175 MHz) (40 dB.Hz) = 39 dB.Hz = 1.7 m
  14. 14. Resultados Signal GNSS Signal/ Carrier + Noise Generator1 (1175 MHz) Receiver + Platform Signal Jammer Signal10 kHz Bw Generator 2 (x MHz) Receptor Analógico Receptor Digital
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